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toolchain: Add __BYTE_ORDER__ definition to the GCC toolchain header.

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__BYTE_ORDER__ preprocessor definition is not defined by older versions
of GCC. The definitions for __ORDER_BIG_ENDIAN__,
__ORDER_LITTLE_ENDIAN__ and __BYTE_ORDER__ by automatic detection using
arch-specific endianness definitions have been added.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2019-09-05 15:22:57 +09:00 committed by Anas Nashif
parent ff2bd93eea
commit 571741a0c5
1 changed files with 35 additions and 0 deletions
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35
include/toolchain/gcc.h
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@ -14,6 +14,41 @@
* Macros to abstract compiler capabilities for GCC toolchain.
*/
/*
* Older versions of GCC do not define __BYTE_ORDER__, so it must be manually
* detected and defined using arch-specific definitions.
*/
#ifndef _LINKER
#ifndef __ORDER_BIG_ENDIAN__
#define __ORDER_BIG_ENDIAN__ (1)
#endif
#ifndef __ORDER_LITTLE_ENDIAN__
#define __ORDER_LITTLE_ENDIAN__ (2)
#endif
#ifndef __BYTE_ORDER__
#if defined(__BIG_ENDIAN__) || defined(__ARMEB__) || \
defined(__THUMBEB__) || defined(__AARCH64EB__) || \
defined(__MIPSEB__) || defined(__TC32EB__)
#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
#elif defined(__LITTLE_ENDIAN__) || defined(__ARMEL__) || \
defined(__THUMBEL__) || defined(__AARCH64EL__) || \
defined(__MIPSEL__) || defined(__TC32EL__)
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
#else
#error "__BYTE_ORDER__ is not defined and cannot be automatically resolved"
#endif
#endif
#endif /* !_LINKER */
/* C++11 has static_assert built in */
#ifdef __cplusplus
#define BUILD_ASSERT(EXPR) static_assert(EXPR, "")